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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caad6dfb7cdd2bc6d8a5d661a19705bb896a9a851538c65ccb5247f5eebd76d9' 
  AND token = 'LjNdqN/gPyAOuJi9Sx9opO+xRFohN3ak8IENp/o39QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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