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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb103f9294f58d86d35d06a451d7003fc8fc61fa9827c7f18d9427b0ec279516' 
  AND token = 'fW9bvYpxgA1p5gO3aQw8FsdJcY3Cs0lqHxz9WgiLqXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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