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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7504c8d6fdbae67bd238879755d82ba0bd0c9b22a8055eb08692448d8d75b0cd' 
  AND token = 'LeprbqOngkRNuf/OmkFUOyMrT5moaVfD2XQyMTWpCoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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