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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75103d2eec1db98660649ca0fc54751f59c3eaf92af5e88f1f86ece8288c36d' 
  AND token = '5x74/ZEc5H7haV3cPOsHEiI9OA2iHM2ETvxm3EQclBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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