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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8800ac0333699e11f5ad8b46dcfc21f4e6bfe99b2f001f0d38998765c98e9e' 
  AND token = 'AwFXV0U7eQw9/V5TXRfzkcPm//Fh6cm59ewU3SveoXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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