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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411ceca1971de52ddcefe3f6c76546a5160ca499f1846944e573eb727e6a8248' 
  AND token = 'H85xuFUftPjJQkH2omWzd4ZmJywnkqaKcP3HK6z7oEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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