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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3bc4fc5f46606e651aff8dbc51e05ef9c9ee3850901c52015c1f94b89d12d4' 
  AND token = 'PqHOQWEHR2w0LtK/zRNDsB5NXvQ7CF8Dok2g9o0dkFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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