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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262d12f3cf78e4cfe7a11e5aae9d1cc1e2de720d39948a1c2459ddfe638ef3f8' 
  AND token = 'eiKr7OJ/lzp9PL2z8pPlMy6zA8L05Juy2YDRolicmSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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