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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e4b87b0ce82296b6ffdf80b500729141c48245dc07666e544148061fc973c30' 
  AND token = 'VJ6UkXXcINHjaarPp6HAlFpbwIEzXZ7ZXWYpHcl4fNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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