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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dccb22961a731a7be2cb208e62a52a456585e97a669f13577579b71e24bab0' 
  AND token = 'ca0ocNimzs2QUp4g1osK7S4jW8qQgv0aZ7ZhcLnbfHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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