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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7b763c1d08ccd97a0af88c8d06dd443856d844530f0ce4daeccd14563c9d99' 
  AND token = '9Ve16xh2WCPkUsEOXpjLFzCf8W9zDZz6IbJGDZxMLUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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