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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd716483599c7ad7c66634ad21d471ea3511105c2fb6681cf30e60e5a3f9f113' 
  AND token = 'MRB6pSPQvvi6ZnD2JupcPll+ih8us/yuUR1+sN3zYx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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