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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfce1ba2e17bb5b9a269656c570d95004f101b5cf868fbf2f6ed1d695559ab6' 
  AND token = 'SBk6Zj0inmR240aP3YKYy8AidHA3zZ6o4UK+gbCZKcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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