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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acb4a3b0b1a7bca7fcc2639bf09f94582cb3656e93a0fe29e97df6c38846217' 
  AND token = 'cGQa90z900LLJtBVA1xk80nIOYMhau1/Dq8RXr7O6hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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