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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833e3cc19bf9fdfa4086525833e982de92e72f74affaca770184a1b6e6c20298' 
  AND token = 'mIt1dzGgGs5/SfMbYZIKdqsCgmSuMD8OF18iFyDd3+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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