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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da154c336ab9a17586e8c57267db02795dc0bb39581701cce4910b577ccbbd51' 
  AND token = 'd5VNx1I1u09Gz6+v++uxam+dChwRa90gvx5/RHrBXa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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