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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3674d27503ba172569f449f810287ff8d0f76ee0abab774b35d50180929a284c' 
  AND token = '07Jxl4T5PFW4/uZxI8MLOXIqBYRpi72b4Z701AlKJFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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