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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de605c3412e7aac71f2634f2d8d89e8035ba4eef4440ab85f97607f45f2bf775' 
  AND token = 'xADrlh7ocWB7VggBb3/LCDYIRVkoyKxanLrXxf6Acs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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