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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c3c797c835851369629dd5f612e84a669ee68e2e542c85b17f70941f79f986' 
  AND token = '3OBccZMze1IWAlZzfmxL04LTZ6mSR0NGfK+SThzc1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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