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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0134dd31aa1b749ce6d5d9972b598e2468d19ce7379f375d31dc1299083318' 
  AND token = 'QjDgda02EBO0qKNpzlJqlGd9Uco6v9jk+3+e/R9Lx5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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