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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ab98cf37fe088b698aacd637457c9b65d8ea3d85979e5e3240ef07a6cdc8d' 
  AND token = 'K3hk7qw5fCLPMqZ4Y0IcZEkBhvbiaPFHu8oFkA7WEPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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