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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87f5dfd62925591983fb2b5425d5e60e5fe1ed91da54c8f2c488593091b25ec' 
  AND token = 'g+iC8chDomgElk8gLBAQPyfmyJNejvFtINd+DPnScdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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