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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0960c7b989065c19f0e733e4e54534833ab31178f5ed93e4f0da4122a8c07262' 
  AND token = 'kkRshHOXRCJribtBQL9jHK0WbLz/ts1pDq6O6t5CkTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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