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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688d75eb520702361850f9b20d829f0626d0a3eaaa6d64c6c7bf40e5842062b7' 
  AND token = 'yfbIhJW8STfReossHiM26X0C1gcVZJKZnr42pWUV0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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