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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4393f1b3648c0aca1a5360a7ab2d8d9a6824806a18ec2bcfd99d15bbb535a8d' 
  AND token = 'Xs9QxhylDGx3Cs0Hjqa8HMfF8tooNsmxyuRfGWiaYDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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