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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd39a4e63e2a034829d7238c9ba3fa19831c36538910b5efe6b6eac94f680df7' 
  AND token = 'SZG+7cCXFDQNS4Yo7M+pM3cjqHXeqNmH7qPbTR/Jais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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