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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce917e54a13013303143246ed4e8b9eb10dfe103a8323c1d9db1ec49168a5ad0' 
  AND token = 'dGQn0hV5P2N+lFB1sIVp8kefswlu9qtxTl1Kvl657j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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