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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cec8ab7d88d13d3b404a71b4d5263c50897e56574386131797d14a2fb97044' 
  AND token = 'JeNbmpMO3M7UEN89KKOe40Cj9ZpFLclOTLcvdENKtLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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