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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef0cca96f963b8214f33a236e71785fd1c1a94d216b6a82b1d202b3b9847d14' 
  AND token = 'IAUDtuikXtfqJgLll9wFNtAw0qy7Rt5zGKL8HHShfo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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