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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc3c093b107bfa6ab2852b3bca1f786f8c29a5152269d8f64d41c2005ea2486' 
  AND token = 'IVqQQ5sveVWKv+85lCcHpyPWLcVOfflzUP5Pnin6yOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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