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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6a2df6cfea45ccf6a7351f8ed0ef9581e0304b4309d54bf96a151f05a33b70' 
  AND token = 'qnT7SPLG22Ppn9JFEGUZ6eiZOKCIKZbHfDAuwC7Ys84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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