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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac5fc581f1194bd5390e164bc330a63f50d415c3937ce77ce53fb9b3c1737cc' 
  AND token = 'UZByDuUkuKBlfuH8OHByzSOZLChJ3W12lSNnR7i2Txo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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