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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d09f4a390027dca9cbdbdbd1b8ecdc953e84f55a86c511622313a6003dfdc73' 
  AND token = '6wzj+QU9Qz8DglORgKKRud5QE58sd3NdUN94QnH5WUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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