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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c898f37c36f2dbfe4f0087df30756408dcdb34c0ac622293bcef7c3d336b1c' 
  AND token = 'u5ju4S6m24OSG85C9a4TLLNf1Y2MXg2lTa+u2gaFLbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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