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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b70081e933913d8c09f113e2e4b7a28981def94ec9548b4c35132999646be2' 
  AND token = 'hYH2fE1yJk/qL6Jc1SODLTHCvN273VrzW40bu6OBxTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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