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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd99dbf4dda7868f4f5c0b570452a3df82bab3b55ea393f8292c5b05c9135ab' 
  AND token = 'dh2KnU6L9o7Q+6AcN7hsRG1PEDBqpu6dGTBqLfWw0DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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