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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7a834b4c0756510e52e1b44d9aba9b3bf0128ab12964028ec1a2ade52aaac6' 
  AND token = 'Mq+rsKti0UcPTEnaodzdpIuCxXKB8u7jZqa1G/Qok/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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