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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec8dba8a3b474f58333c3212d7b07d24e2065ec4766c75f3cc81daa7050825f' 
  AND token = 'npalCbZy1vdADFU00jybb/h0RsH+NaBvYcyBnhJLvbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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