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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3e29978bc27806c5003a3d9f3400dd317a7eb3f9e0f070b3a036f0c7b9b317' 
  AND token = 'Ia9cdc7LJa6s0ibNbog9DxM3d0IMXateGehBoQSesGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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