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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9229f9163a6614f95b9248bd40a9815e6d842740bf76f38635e9e22f0370c812' 
  AND token = 'YjQ2/qHyoCn2BN16U9kCW5OBfX7asvWA3OsEwYWgUlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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