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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0009691fdc0b1374278e1a9180ded2da7796a88395e61d0f0ca042c0f22e14' 
  AND token = 'Y+BgcmTsBxbPaputs2NCdQrcodKyzrJdMK/Ef7OtK6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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