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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56de95c6166a5e6d54e47292a47b410ee2fc97cbf4c533af6409540c97947f41' 
  AND token = 'QoO9o1XtUWOZoNd0AcMOM4ZYfLo5Ut3yQ1bHDY4RONg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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