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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0c471e485938854352ac80e0511334c557e7d703e6a87b794237e1ba931a33' 
  AND token = 'xs3xmnWnBDjXlf+hXnGmeERIvcItqoqFGvcuBdN/+3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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