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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac376b043fb3f9dea9c35a9853100151d39fe90a0dafed0f5d61eb35996922b3' 
  AND token = 'uxSCvPIkTcjvp/noq2qOz1WYqg1xp40yFR+QbIsKVNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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