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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5130940a8d9bb7e303073fd1b5ccfbf218f405a313e11ee56194203fcb3a9b88' 
  AND token = 'WoYERZzD2DyV2G5stMbwZzb0cUsAdMEAy3WyET5hKcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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