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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31ed061cfdc3e33470b2669059d56cb8006d75c1a87b241e5b401e41244168a' 
  AND token = '3sVsuItFWpWnNiC3ZZmv4+9Sih5GxI925Ko7Yfy65Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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