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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc91611e0b6b12cf7a7d37ac8c7271803209567635c722d632bba0b779f90e8f' 
  AND token = 'hVU0iKUZfzdv6VLrNadJ5f6amgJC+XBr3IeRDuSOzkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}