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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2de523400dd2265e8b2f027c3505e0b74d78bff3eb690352c789caed39f5f1a' 
  AND token = 'j9MLtQOGN6VQ5S8v8brcIRTIfr+8Rc5RIyuay2c9lB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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