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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb7ff1892c5ca172dbd6323c98fad8d31fbdf8a83fe24d139551ae16e7763df' 
  AND token = 'H3nI8Zpo2yyrHpLmwNkS9I6cX21vYOs23Fabv2Ci3e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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