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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36eb62d605047b9e0998d9d6ac26d62aad22e0ddab57fd41b81fae211e4942b8' 
  AND token = 'p2FlhUBSV+BY5gb3mty0+16gqSXAo1mLNerFOHE1+jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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