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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ac7e4002f09be0c0798941b338248e415f256be6b3db08b7959d16197aa9cb' 
  AND token = 's6gD7R75NNI4AY/VeyYq1hn6nJ41lEKuGTAKBfh/bfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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