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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fbe731c97a24b1b39fcc2cebf66be8b170ee68097bd94c36176d3d6c891637' 
  AND token = 'frwkQnsZJxRPrVf0+F3lxWJt7/ENTO+NysqWY/lVP+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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