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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5195d2b85779641a28f6cedf9aeeb5e849ed24274b7ee47ac3e8a752c0baa082' 
  AND token = '3GubwG3PLhHlMpyVP26Kpa5z7xFD6nd8Vdy9u6QprZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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