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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076fb5b207ba17b81c25b621c3570468ae5d0fad4c0a1ab6dcf411088a2668c0' 
  AND token = 'KuuiNfIGW5XCbc6xfJDim/aY012Se3U9x3Kzji+dIpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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